A ssigltor  to



`F. G. MARBACH.

SCREW CLAMP APPLICATION flLED DEc.e,1917.

NJN

Panted Got. 28, 1919.

ATTUENEYS NrnTTTnn sTnTns PATENT orricn.

FRANK e. MARBAGH, or CLEVELAND, OHIO, ssrenloit To wIrlrLIAM" Taos'rrnn,or

Y CLEVELAND, oHro.

SCREW-CLAMP'.

To all lw/z om t may conce/rn Beit known that l, FRANK G. MARBACH,citizen of the United States, residing at Cleveland, in the county ofCuyahoga and State of Ohio, have invented certainnew and usefulImprovements in Screw-Clamps, of which the following is a specification.

My invention pertains to an improvement in screw clamps, and theinvention consists in the dual bearing for the screw and in otherfeatures thereof, substantial-ly as shown and described and particularlypointed out in the claims.

In. the accompanying drawings, Figure l is a front edge elevation of theclamp, andV Fig. 2 is a side elevation thereof with a portionv at thetopbroken away. Fig. 3 is a cross section on line 3 3, Fig. 2. F ig. 4 isa. detail of the body of the clamp;4 Fig. 5 is a detail of the eyeattachment for the nut and screw, and Fig. G is a detail of the nut.Fig. 7 is a detail of the dual bearing on the bottom of the clamp.

lt will be seen by the foregoing details that several improvements areembraced in the present clamp, and which, in respect to shape, has theusual curved or substantially 'U or yoke-shaped body b and clampingscrew s with a swivel engaging head or bearing 2 on the end thereof.

In clamps of this kind as hitherto made, so far as I know and believe,there has always been only a single bearing point intogli-al with thefoot of the body o and which was directly beneath the screw. Hence incase the screw was somewhat loose in its nut,which was and is a commonexperience with such clamps, or the stock gripped was uneven orotherwise diliicult Vto engage, there was inevitable tendency in thescrew to spring off of center and getout of alinement with the saidbearing and to fail to do its work acceptably.

For this reason, and to meet incidental defects in construction andoperation, and to provide'a clamp in which these cbjections are obviatedI have built the present clamp with a separate bearing piece i on whichthere are two distinct and separate bearings 5 welded or otherwisepermanently secured on the lower end or foot of the body h. ln thisconnection it may be noted that the said body consists of a piece of'Tiron bent to the desired shape, and that the said bearing piece is laidacross the iiat flanged Specification of LettersiPateiit.'

Patented Oct. 2S, 15919.

Serial -O. 2Q5f'19'. i

inside thereof,and might be lriveted through said flanges if preferred'.This p-iece 4- has the distinguishing feature of two raised bearingsspaced apart relatively as shown and so positioned that both will come,in part, directly beneath the direct down pressure of the screw throughthe head 2 thereon. This defeats all possible tendency in the screw tospring or work laterally or to get bent out of usable shape, as wascominonwith the single bearing clamp as heretofore made, andparticularly insures a sure workingv grip under any conditions of thework.

Other novel features are seen at the top of the clamp. These comprisethe special attachment 7?, consisting of a strip of metal havingsubstantially the width of the back ofthe clamp= and bent upon itselfwith an eye- 8 formed in the bend and having the sides thereof securedby rivets or their equivalent against opposite sides of the said back orrib ll. The end portion of the said rib or back is cut away or removed asuiiicient distance from the end of the said body to provide a flatsurfaced projection 9 across the side iianges, and a central opening isformed down through the said projection in line with said eye to receivethe thimble-shaped nut l0, inserted from beneath and having a bead orflange' bearing against the bottom of the said projection. The said nutlits snugly in the eye 8 and the bead thereon takes the upward thrust,and said nut is internally threaded to receive the screw s, which isadapted to be operated in the usual manner through the linger grip 12 atits top. A snug lit of the nut in the eye 8 and in the opening throughthe flanged base of the body b secures the nut firmly therein for alloperating purposes, and an exceptionally strong support for the nut isprovided by this construe tion and which also helps to hold the screw inalinement on the work.

lt will be noticed that lthe bearing bar 4- extends transversely of thebody b and that the bearings 5 come outside said body about half theirwidth on each side, but the portion thereof engaged by head 2 is withinthe flanges 11i of the said body.

The words inner and outer and top and bottoni are relative, having inview the clamp as seen in the drawing with the nut 8 aboveV and thebearings v5 below.

What I claim is: Y

l. A screw clamp having a body of substantially U-shape with one armformed with an eye and rivet openings, a beaded nut sleeved within saideye, a clamping strip for said nut secured to said arm by rivets passingthrough said openings, a screw in said nut, and a swivel head thereon,and a separate permanently affixed transversely across the engaging'extremity of the other arm and provided with a raised bearing on eachend out of axial alinement with said screw and spaced apart at themiddle of said bearing piece.

2. A screw clamp having a body formed of T iron bent into the desiredshape and having` a flat-sidedv extremity at one end provided with anopening through the saine, an attachment having an eye set over saidopen ing and afIiXed to opposite sides of the rib on said body, atubular nut for the screw set into said eye and opening,vand a screwengaged in said nut.

3. A screw clamp having a body bent to approximately Ushape and having arib centrally on its back and an attachmentat one Copies of this patentmay be obtained for bearing piece of metal4 end thereof constructed of astrip of metal having the depth substantially of the said rib andprovided with a circular bend forming an eye at its middle andpermanently aliXed at its ends on opposite sides to the said rib, thesaid body having a flat end portion with an opening coincident with saideye, a. tubular nut for the operating screw extending through said holeinto said eye and lprovided with an annular enlargement on its inner endbearing against the said flat end portion of the body and a screwengagedin said nut.

4. A screw clamp, Comprising a U-vnember having one arm thereof providedwith two shallow lat bosses lying in Vthe same plane relatively neareach other and the other arm being provided with a thimbleshaped nut'and a clamping strip for said nut riveted to said arm, said nut havinga clamping screw opposite and intermediate said bosses.

Signed at Cleveland, in the county of Cuyahoga, and State of Ohio, this1st day of December, 1917.

FRANK G. MARBACH.

ve cents each, by addressing the Commissioner of Patents, Washington, D.C.

